Numerical Analysis on Improving the Rectangular Texture Floating Ring Gas-film Seal Characteristics with Different Bottom Shapes

Shipeng, W.; Xuexing, D.; Junhua, D.; Jingmo, W.

doi:10.47176/jafm.16.07.1717

Numerical Analysis on Improving the Rectangular Texture Floating Ring Gas-film Seal Characteristics with Different Bottom Shapes

Document Type : Regular Article

Authors

College of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China

10.47176/jafm.16.07.1717

Abstract

Finding the right texture pattern to effectively improve the sealing performance of the floating ring gas film seal has always been a topic of interest for engineers. Herein, to reveal the effect of the rectangular textured base shape on the sealing characteristic parameters of floating ring gas film seal, four bottom shapes of rectangle, isosceles triangle, left triangle and right triangle were proposed. The governing equations were solved by the finite difference method and the correctness of the theoretical results was verified by the test bench. The effect of operating conditions parameters on the sealing performance were also analyzed. The results reveal that the trends of the experimental results is consistent well with the theoretical results, in which the relative errors are all less than 9%. It indicates that the theoretical model is scientific and valid. As the speed and inlet pressure increase, the texture bottom shape significantly changes the distribution of pressure and temperature field. And the average gas film thickness determines whether the texture produces an effect or not. Under the same operating conditions, a right-angled triangular bottom shape can obtain a good stability and cooling effect for the sealing device. With a bottom shape of the right triangle and a bottom shape of the rectangle, the maximum difference in opening force and gas film temperature rise were calculated to be 234.91 N and 0.61 ^oC, respectively. The research results provide theoretical support for further study of the textured floating ring gas film seal and a reference for texture optimization.

Keywords

Main Subjects

Gas dynamics

References

Abuelma’atti, M. T. and A. M. Abuelmaatti (2013). Effect of electromagnetic interference (EMI) on the DC shift, harmonic, and intermodulation performance of NMOSFET mirror with a capacitor between the mirror node and the ground. IEEE Transactions on Electromagnetic Compatibility 55(5), 849-854.##

Andrés, L. and Z. Ashton (2010). Comparison of leakage performance in three types of gas annular seals operating at a high temperature (300^oC). Tribology Transactions 53(3), 463-471.##

Chen, X., J. K. Mills and G. Bao (2020). Static performance of the aerostatic journal bearing with grooves. Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 234(7), 1114-1130.##

Du, Y. and M. Li (2020). Effects on lubrication characteristics of water-lubricated rubber bearings with journal tilting and surface roughness. Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 234(2), 161-171.##

Gang, M., Z. Wei and X. Shen (2011). Analysis of Parameters and performance for spiral grooved cylindrical gas film seal. Procedia Engineering 23(5), 115-119.##

Guo, H., S. Yang and S. Zhang (2019). Influence of temperature–viscosity effect on ring-journal speed ratio and stability for a hydrodynamic floating ring bearing. Industrial Lubrication & Tribology 71(4), 540-547.##

Hou, G., H. Su and G. Chen (2020). Performance analysis of compliant cylindrical intershaft seal. Science Progress 103(3), 01-24.##

Hu, T., L. Xie and J. Liu (2019). Effects of rotor surface texture on rotary vane actuator end sealing performance. Tribology International 140, 1058-1068.##

Jin, J., X. Chen and Y. Fu (2020). Optimal design of the slip-texture on a journal-bearing surface. Industrial Lubrication and Tribology 73(2), 230-237.##

Joachimmiak, D. and P. Krzyslak (2019). Analysis of the gas flow in a labyrinth seal of variable pitch . Journal of Applied Fluid Mechanics 12(3), 921-930.##

Karampour, H., Z. Wu and M. S. Mason (2021). An experimental investigation of forces on a textured cylinder at subcritical reynolds numbers. Journal of Applied Fluid Mechanics 14(6), 1787-1793.##

Lu, J. (2020). Theoretical optimization and experiment on lubrication of floating microgroove cylindrical seal. Industrial Lubrication and Tribology 72(10), 1217-1226.##

Lu, P., R. J. Wood and M. G. Gee (2017). The use of anisotropic texturing for control of directional friction. Tribology International 113, 169-181.##

Ma, C., S. Bai and X. Peng (2016). Thermo-hydrodynamic characteristics of spiral groove gas face seals operating at low pressure. Tribology International 95, 44-54.##

Ma, P., B. Jiang and J. Zhang (1981). Critical assessment of viscosity and its correlation with temperature for gaseous substances under normal pressure. Journal of Chemical Industry and Engineering 32(3), 193-205. (in Chinese).##

Mishra, S., A. Choudhury and S. Sahu (2014). CFD investigation of influences of reverse textures on bearing surface of a journal bearing. Journal of Applied Fluid Mechanics 7(3), 395-399.##

Pei, S., H. Xu and M. Yun (2016). Effects of surface texture on the lubrication performance of the floating ring bearing. Tribology International 102, 143-153.##

Shen, C. and M. M. Khonsari (2015). Numerical optimization of texture shape for parallel surfaces under unidirectional and bidirectional sliding. Tribology International 82, 1-11.##

Shi, L., Y. Zhang and S. Chen (2019). Comparative research on gas seal performance textured with microgrooves and microdimples. Journal of the Brazilian Society of Mechanical Sciences and Engineering 41(7), 1-10.##

Singh, N. and R. K. Awasthi (2021). Influence of texture geometries on the performance parameters of hydrodynamic journal bearing. Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 235(10), 56-72.##

Sun, X., P. Song and X. Hu (2021). Cross-scale flow field analysis of sealing chamber and end face considering the CO₂ real gas effect. Journal of Applied Fluid Mechanics 14(4), 979-991.##

Tala-Ighil, N. and M. Fillon (2015). A numerical investigation of both thermal and texturing surface effects on the journal bearings static characteristics. Tribology International 90, 228-239.##

Tibos, S. M., J. A. Teixeira and C. Georgakis (2017). Investigation of effective groove types for a film riding seal. Journal of Engineering for Gas Turbines and Power 139(7), 2503-2511.##

Wang, T., W. Huang and X. Liu (2014). Experimental study of two-phase mechanical face seals with laser surface texturing. Tribology International 72, 90-97.##

Wang, X., M. Khonsari and S. Li (2019). Experimental verification of textured mechanical seal designed using multi-objective optimization. Industrial Lubrication and Tribology 71(6), 766-771.##

Wang, X., L. Shi and Q. Dai (2018). Multi-objective optimization on dimple shapes for gas face seals. Tribology International 123, 216-223.##

Xie, J., C. Ma and S. Bai (2020). Thermo-distortion characteristics of spiral groove gas face seal at high temperature. Numerical Heat Transfer Fundamentals 77(3), 242-256.##

Yang, X., X. D. Peng and X. K. Meng (2019). Thermo-elasto-hydrodynamic analysis of triangular textured mechanical face seals. Journal of Zhejiang University-SCIENCE A 20(11), 864-881.##

Zhang, K., W. L. Li and J. Li (2011). Electromagnetic Interference’s Effect on the Performance of Electro-Hydraulic Control System. Applied Mechanics and Materials 44-47, 1218-1222.##